terça-feira, junho 27, 2017

Tecnologia e salários

Há dias chamei a atenção para isto:

Agora encontro:
"even more critically, the enabling technology view implies that any improvement in technology should lead to higher wages for all types of workers. But wage declines for low-education workers have been the norm not the exception over the past 30 years in the US labor market. [Moi ici: Acredito que grande parte desta tendência deveu-se à deslocalização?] In particular, the real wages of workers with less high school, high school or some college have all fallen sharply since the early 1970s. The inability of this conical framework to account for the pervasive phenomenon of declining real wages of certain groups of workers is one of its most jarring shortcomings.
In particular, wages at the bottom, median and the top move very differently over different time periods. Most notably, in contrast with simple skill-biased technological change view, we do not see an opening of the gap between median and bottom wages.
there is an extended period from the mid-1980s to the mid-1990s where wages at the bottom are increasing more rapidly than wages in the middle of the distribution.
In contrast to a view based on enabling technologies helping the most highly skilled workers, we see rapid employment growth at the bottom of the wage distribution both in the 1990s and 2000s. The picture that emerges is thus one in which the economy is generating considerably more employment in lower- paid occupations than in occupations in the middle of the wage distribution.
Finally, we can also verify that this is not just a US phenomenon. The middle-paying occupations have contracted in every European country between 1993 and 2006, strongly suggesting that the employment patterns we are witnessing in the United States are due to common technological trends rather than idiosyncratic US factors.
In contrast to the standard framework based on enabling technologies, replacing technologies can reduce wages. This contrasts with the predictions of the canonical model we discussed in the previous section. The key is the difference between enabling and replacing technologies.

  • Even with a single type of labor competing against technology or capital, a set of tasks shifting from labor to capital can reduce wages. This effect is further strengthened if there are multiple types of labor, and new technologies directly take away some of the tasks performed by a specific type of labor (for example, semi-skilled manufacturing workers or operators).
  • For the same reasons as articulated in the previous bullet point, replacing technologies displace workers, and may cause unemployment.
  • If new technologies replace tasks in the middle of the pay distribution, they will cause polarization of employment. Intuitively, these new technologies will take away the middle paying occupations, and thus the overall wage distribution will have a smaller, in some sense ‘hollowed’ middle, causing wage polarization. Interestingly, because workers dislocated by technology from the middle of the pay distribution will compete with others, changes in employment structure may be divorced from wage growth patterns. As a result, we may expect to find faster growth of employment in lower- paying occupations as those dislocated by technology also seek employment in these occupations, which is confirmed by the changes in employment structure shown in the figure below, but this does not necessarily imply faster wage growth in these expanding occupations."

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